dillyrx7

Hi, I'm very new to the whole rotary thing, I just had a couple quick questions, if someone could help me, that would be fantastic. I was looking around on the forum, and saw S4 and S5 being put around a bit, I was wondering what the difference is. Also, about how long should I let it warm up and cool down when starting it and after driving, non-turbo 88 GXL

sureshot

S4 = 86-88

S5 = 89-91 slightly newer technology, a little more power, but heavier.

dillyrx7

So do the s5 mods fit onto an s4?

sureshot

Warm up? - When the temp gauge starts to move, you're warmed up.

Cool down is only a factor for aftermarket non-water cooled turbo's.



The only issue is starting it cold & shutting down before it starts to warm up.

There is a flaw in the ECU program that tends to flood the motor the next time you try to start it.

dillyrx7

oh, ok... thanks so much for taking the time to help a newbie out, I've always loved the way these cars looked, and the fact that it was a rotary, just never really understood the concept, and heard bad stories about letting the warm up, or they'll "f" up

sureshot

Most will. Exceptions I can think of:

Fuel injectors - S4= low inpedence, S5= high impedence

The ECU plugs are different, so plug & play fuel controllers have to be adapted.

Body parts are the same.

dillyrx7

awesome, you're fantastic, thanks again for your help.

sureshot

Just try not to shut it off cold or you may have to go through the "unflood" procedure later.



The RX-7 is a medium high performance design, so it takes medium high maintenance.

3000 mile oil changes are important, and don't let it overheat.

sureshot

When you have any engine that makes more than 2HP per CI, you have to pay attention to the little things.



In case you didn't notice, there is a link, in my sig below, to a complete set of service manuals.

neejo

Welll.. sort of for the injectors.

86 - 87 1/2 models are low impedence injectors requiring a resistor block to raise the resistance brought to the ECU and 87 1/2 - 88 injectors are high impedence, with the resistance brought directly back to the ECU through the harness.

There's a way to tell the difference between the injectors by color and shape of the connectors, but I forget =P



[quote name='sureshot' date='Feb 17 2005, 12:53 PM']Most will. Exceptions I can think of:

Fuel injectors - S4= low inpedence, S5= high impedence

The ECU plugs are different, so plug & play fuel controllers have to be adapted.

Body parts are the same.


[/quote]